Significant quantities of sulfonamide antibiotics are continuously released into the ambient environment; thus, they have emerged as serious pollutants that may inflict ecological damage. Herein, 4-phenoxyphenol-modified g-C₃N₄ (PCN) was initially prepared via the copolymerization of dicyandiamide and 4-phenoxyphenol, which demonstrated excellent performance for light-harvesting and the promotion of photon-generated carrier separation. Optimized PCN exhibited 4.5-fold higher photocatalytic degradation activity for sulfisoxazole (SIZ) than pure g-C₃N₄ under blue-light (LED) irradiation. Among SIZ, sulfapyridine (SPD), sulfadiazine (SDZ) and sulfadimethazine (SMZ), SIZ and SMZ are more vulnerable to attack in PCN photocatalytic system due to structure containing methyl. Electron spin resonance and photoelectrochemical experiments revealed that the faster charge separation of PCN promoted the formation of additional reactive oxygen species. Moreover, the potential transformation pathways of SIZ were hypothesized through the frontier molecular orbital theory and HRAM LC-MS/MS. Hence, the present work is expected to be of important reference value for sustainable environmental restoration.

大量的磺胺类抗生素不断释放到周围环境中。因此，它们已成为严重的污染物，可能造成生态破坏。在此，最初通过双氰胺和4-苯氧基苯酚的共聚制备4-苯氧基苯酚改性的gC ₃ N ₄（PCN），其表现出优异的光收集性能和促进光子产生的载流子分离。优化的PCN对磺胺异恶唑（SIZ）的光催化降解活性比纯gC ₃ N ₄高4.5倍在蓝光（LED）照射下。在SIZ中，磺胺吡啶（SPD），磺胺嘧啶（SDZ）和磺胺二甲嘧啶（SMZ），SIZ和SMZ由于含有甲基结构，更容易在PCN光催化系统中受到攻击。电子自旋共振和光电化学实验表明，PCN更快的电荷分离促进了其他活性氧的形成。此外，通过前沿的分子轨道理论和HRAM LC-MS / MS推测了SIZ的潜在转化途径。因此，目前的工作有望对可持续的环境恢复具有重要的参考价值。